Oxidation After Breakdown of the Chromium-Rich Scale on Stainless Steels at High Temperature: Internal Oxidation
详细信息 查看全文
- 作者：T. Jonsson ; S. Karlsson ; H. Hooshyar ; M. Sattari ; J. Liske…
- 刊名：Oxidation of Metals
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：85
- 期：5-6
- 页码：509-536
- 全文大小：2,906 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Inorganic Chemistry
Tribology, Corrosion and Coatings
Metallic Materials - 出版者：Springer Netherlands
- ISSN：1573-4889
- 卷排序：85
文摘
Breakaway oxidation of alloy 304L at 600 °C was studied in four environments (O2 + H2O + KCl, O2 + H2O + SO2 + KCl, H2 + H2O + Ar, O2 + K2CO3) for up to 168 h. The resulting scales were investigated by FIB/SEM, SEM/EDX, STEM/EELS, STEM/EDS and oxidation was elucidated by thermodynamic calculations (Thermo-Calc). The initial thin protective scale broke down in all cases. After breakaway, the scale consisted of two layers, i.e. an inward growing spinel/reaction zone and an outward growing iron-rich layer. The general features and microstructure of the scales after breakaway were similar in all environments and were explained in terms of: (1) Different diffusivities of Cr3+ and Fe2+ in the spinel oxide. (2) The appearance of a miscibility gap in the FeCr and FeCrNi spinel oxides. (3) The equilibrium composition of the spinel (at low pO2 Ni is not present in the spinel).KeywordsOxidationBreakaway corrosion304LAlkaliWater vapourInternal oxidationTEM